/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.editor;

import a.annotation.proguard.classfile.attribute.annotation.*;
import proguard.classfile.*;
import proguard.classfile.attribute.annotation.target.TargetInfo;
import proguard.classfile.attribute.annotation.visitor.*;
import proguard.classfile.util.SimplifiedVisitor;

/**
 * This TypeAnnotationVisitor adds all type annotations that it visits to the given target annotation element value,
 * target annotation attribute, or target parameter annotation attribute.
 *
 * @author Eric Lafortune
 */
public class TypeAnnotationAdder extends SimplifiedVisitor implements TypeAnnotationVisitor {
    private static final ElementValue[] EMPTY_ELEMENT_VALUES = new ElementValue[0];

    private final ProgramClass targetClass;
    private final AnnotationElementValue targetAnnotationElementValue;
    private final AnnotationsAttributeEditor annotationsAttributeEditor;

    private final ConstantAdder constantAdder;

    /**
     * Creates a new TypeAnnotationAdder that will copy annotations into the given target annotation element value.
     */
    public TypeAnnotationAdder(ProgramClass targetClass, AnnotationElementValue targetAnnotationElementValue) {
        this.targetClass = targetClass;
        this.targetAnnotationElementValue = targetAnnotationElementValue;
        this.annotationsAttributeEditor = null;

        constantAdder = new ConstantAdder(targetClass);
    }

    /**
     * Creates a new TypeAnnotationAdder that will copy annotations into the given target annotations attribute.
     */
    public TypeAnnotationAdder(ProgramClass targetClass, AnnotationsAttribute targetAnnotationsAttribute) {
        this.targetClass = targetClass;
        this.targetAnnotationElementValue = null;
        this.annotationsAttributeEditor = new AnnotationsAttributeEditor(targetAnnotationsAttribute);

        constantAdder = new ConstantAdder(targetClass);
    }

    // Implementations for AnnotationVisitor.

    public void visitTypeAnnotation(Clazz clazz, TypeAnnotation typeAnnotation) {
        TypePathInfo[] typePath = typeAnnotation.typePath;
        TypePathInfo[] newTypePath = new TypePathInfo[typePath.length];

        TypeAnnotation newTypeAnnotation = new TypeAnnotation(
            constantAdder.addConstant(clazz, typeAnnotation.u2typeIndex), 0, typeAnnotation.u2elementValuesCount > 0
                ? new ElementValue[typeAnnotation.u2elementValuesCount] : EMPTY_ELEMENT_VALUES,
            null, newTypePath);

        // TODO: Clone array.
        newTypeAnnotation.referencedClasses = typeAnnotation.referencedClasses;

        // Add the element values.
        typeAnnotation.elementValuesAccept(clazz, new ElementValueAdder(targetClass, newTypeAnnotation, false));

        // Set the target info.
        typeAnnotation.targetInfo.accept(clazz, typeAnnotation, new TargetInfoCopier(targetClass, newTypeAnnotation));

        // Copy the type path.
        for (int index = 0; index < typePath.length; index++) {
            TypePathInfo typePathInfo = typePath[index];
            TypePathInfo newTypePathInfo =
                new TypePathInfo(typePathInfo.u1typePathKind, typePathInfo.u1typeArgumentIndex);

            newTypePath[index] = newTypePathInfo;
        }

        // What's the target?
        if (targetAnnotationElementValue != null) {
            // Simply set the completed annotation.
            targetAnnotationElementValue.annotationValue = newTypeAnnotation;
        } else {
            // Add the completed annotation.
            annotationsAttributeEditor.addAnnotation(newTypeAnnotation);
        }
    }
}